The correct answer is that t<span>here are probably very few astronauts with twin siblings.
We have to take into consideration that astronauts are a very small group of people and that there is only a small chance that one of them has an identical twin. Although the tests can be hard to do and categorize these kinds of tests and measures are not unethical as long the scientists have the person's permission. Currently, we possess the technology and resources to keep a person in space for a year, but it will be really hard to find more astronauts that have identical twins.
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Possible contaminate will be Proteus or Salmonella. To differentiate the two genera urease test can be accomplished. However, urease test, Proteus will produce a positive test result.
This test can be done to determine the ability of an organism to split urea. The principle of urease test is that urea is the product of decarboxylation of amino acid. Splitting of urea via hydrolysis will produce ammnonia and CO2. The CO2 produce allows the formation of bubbles.
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Answer:
Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.
Explanation: